yes.c

操作系统源代码

/*	yes 1.4 - print 'y' or argv[1] continuously.	Author: Kees J. Bot
 *								15 Apr 1989
 */
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main(int argc, char **argv)
{
	char *yes;
	static char y[] = "y";
	int n;

	yes= argc == 1 ? y : argv[1];

	n= strlen(yes);
		
	yes[n++]= '\n';

	while (write(1, yes, n) != -1) {}
	exit(1);
}